JavaScript: Fix bug in javascript/tree-debug.ts for long indents

Author: knutwannheden

rewrite-javascript/rewrite/src/javascript/tree-debug.ts

@@ -62,9 +62,9 @@ const EXCLUDED_PROPERTIES = new Set([
 ]);
 
 /**
- * Subscript digits for counts.
+ * Subscript digits for counts (index 0-9 maps to ₀-₉).
  */
-const SUBSCRIPTS = ['', '₁', '₂', '₃', '₄', '₅', '₆', '₇', '₈', '₉'];
+const SUBSCRIPTS = ['₀', '₁', '₂', '₃', '₄', '₅', '₆', '₇', '₈', '₉'];
 
 /**
  * Format a count as subscript. Count of 1 is implicit (empty string).

rewrite-javascript/rewrite/test/javascript/tree-debug.test.ts

@@ -86,6 +86,16 @@ describe("LST Debug Utilities", () => {
             const result = formatWhitespace("  \t\t");
             expect(result).toBe("'·₂-₂'");
         });
+
+        test("10 spaces shows ·₁₀", () => {
+            const result = formatWhitespace("          "); // 10 spaces
+            expect(result).toBe("'·₁₀'");
+        });
+
+        test("12 spaces shows ·₁₂", () => {
+            const result = formatWhitespace("            "); // 12 spaces
+            expect(result).toBe("'·₁₂'");
+        });
     });
 
     describe("formatSpace", () => {